Properly charging your batteries might take longer-it takes about 4 hours to fully charge our AA picks, and 2 hours to fill our AAA picks-but it can improve their long-term performance. Batteries with a listed capacity of less than 1,000 mAh (such as our AAAA pick) should be charged at a rate of 300 mA, those between 1,000–2,000 mAh (like our AAA picks) at 500 mA, and those above 2,000 mAh (like our AA picks) at 1,000 mA. Selecting the optimal charging rate for your batteries can help maximize their longevity. Most AA/AAA battery chargers don’t let you set the rate of charge, but some techier models do (including one of our favorite chargers, the Tenergy TN456).
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